This question requires knowledge on the association of Indian freedom fighters with different movements/Satyagrahas.

Option 1 suggests that both (A) Champaran with Rajendra Prasad and (B) Ahmedabad Mill Workers with Morarji Desai are correctly paired which they are not. Prasad was indeed associated with the Champaran Movement, but Desai was not actively involved in the Ahmadabad Mill Strike.

Option 2 alleges that (B) Ahmedabad Mill Workers with Morarji Desai and (C) Kheda with Vallabhbhai Patel are matched correctly. However, as discussed, Desai was not actively involved in the Ahmadabad Mill Strike, making this pairing incorrect.

Option 3 claims that (A) Champaran with Rajendra Prasad and (C) Kheda with Vallabhbhai Patel are correctly matched. Both pairs are indeed correctly matched.

Option 4 indicates that all the three pairs are correctly matched. However, as discussed earlier, pairing (B) is incorrect.

Alert - correct answer should be 3 as it correctly matches both the pairs i.e., (A) Champaran with Rajendra Prasad and (C) Kheda with Vallabhbhai Patel.